Classify the input using one of these labels: neutral, positive, and negative. @united  Thank you for a wonderful global first class flight on your 777 to FRA. Great service. (cont) http://t.co/46n9kDcsxU
system
Classify the input using one of these labels: neutral, positive, and negative. @united  Thank you for a wonderful global first class flight on your 777 to FRA. Great service. (cont) http://t.co/46n9kDcsxU
user
positive
assistant
system
Classify the input using one of these labels: neutral, positive, and negative. @united  Thank you for a wonderful global first class flight on your 777 to FRA. Great service. (cont) http://t.co/46n9kDcsxU
user
neutral
assistant